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DOI: 10.1055/s-0030-1258038
A Facile Synthesis of Novel Acyclo-C-Nucleoside Analogues from l-Rhamnose via Variants of Bohlmann-Rahtz Reaction
Publication History
Publication Date:
12 August 2010 (online)
Abstract
Synthesis of a series of novel acyclo-C-nucleoside analogues bearing substituted pyridines, dihydro-6H-quinolin-5-ones, dihydro-5H-cyclopentapyridin-5-one, tetrahydrocyclohepta[b] pyridine-5-one, and azafluorinone has been achieved in very good yields, through CeCl3˙7H2O-NaI-catalyzed one-pot condensation of a variant of the Bohlmann-Rahtz reaction using β-enaminones derived from l-rhamnose, acyclic and cyclic 1,3-dicarbonyls, and ammonium acetate. Ready availability of reactive β-enaminones, use of a cerium catalyst, and shorter reaction times are the advantages of this protocol over previous methodology. A plausible mechanism invoking cerium-catalyzed sequential Michael addition-cyclodehydration-elimination reactions is also presented.
Key words
Bohlmann-Rahtz reaction - acyclo-C-nucleosides - CeCl3˙7H2O-NaI - one-pot condensation - β-enaminone - l-rhamnose - heterocycles
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References and Notes
We thank one of the referees for suggesting conjugated dihydropyridine intermediate in the mechanistic sequence in Scheme [³] .